Responds to a request for a TopDownLeftRight (TDLR) ordered resend of the pixel data from an
ImageConsumer. When an
ImageConsumer being fed by an instance of this
ImageFilter requests a resend of the data in TDLR order, the
FilteredImageSource invokes this method of the
ImageFilter.
An ImageFilter subclass might override this method or not, depending on if and how it can send data in TDLR order. Three possibilities exist:
- Do not override this method. This makes the subclass use the default implementation, which is to forward the request to the indicated
ImageProducer using this filter as the requesting ImageConsumer. This behavior is appropriate if the filter can determine that it will forward the pixels in TDLR order if its upstream producer object sends them in TDLR order. - Override the method to simply send the data. This is appropriate if the filter can handle the request itself — for example, if the generated pixels have been saved in some sort of buffer.
- Override the method to do nothing. This is appropriate if the filter cannot produce filtered data in TDLR order.
@see ImageProducer#requestTopDownLeftRightResend
@param ip the ImageProducer that is feeding this instance ofthe filter - also the ImageProducer that the request should be forwarded to if necessary
@exception NullPointerException if
ip is null